Wall-grip.



E. WHITNEY.

WALL GRIP.

APPLICATION rum) NOV. 22. 1909.

1,007,759. Patented Nov. 7, 1911.

mm 6 M j W COLUMBIA PLANUGRAPH co., WAS c.

UNITED STATES PATENT OFFICE.

EGBERT WHITNEY, OF OMAHA, NEBRASKA.

WALL-GRIP.

To all whom it may concern:

Be it known that I, Eennn'r lVHiTNEY, of the city of Omaha, county of Douglas, and State of Nebraska, have invented certain new and useful Improvements in W all- Grips, which improvements are described in the following specification and are illustrated by the accompanying drawings.

The invention relates to wall grips of that kind which are used for the attachment and support of scafi'olds employed in erecting brick buildings.

It is the object of the invention to attach scaffolding easily and securely to the walls of such buildings during the process of construction; to render a wall grip of this kind light and strong; to reduce to a minimum the quantity of lumber requisite for such scaffolding; to attach the grip to the wall easily= and quickly; to attach the same to the scaffolding without injuring the scatfolding material or unfitting the same for subsequent use for other purposes; and in general to produce a superior wall grip of the kind which is above specified. To accomplish this object, I form my improved wall grip of a single piece of iron or other metal, comprising a horizontal base, a slotted arm rising obliquely from one end of the base, a standard rising vertically from the other end of the base, a Hat arm projecting horizontally from the top of the standard and armed with downwardly di rected spurs.

The best way in which I have contemplated applying the principles of the invention, is shown in said drawings.

Figure 1 is a side elevation of two wall grips which are constructed in accordance with those principles and are shown engaging as in actual service both a veneer wall which is in process of construction and a scaflolding which is outside the building. Fig. 2 is a like elevation of one of my improved wall grips similarly engaging both a common brick wall and a piece of scaffolding, which is either outside of the building or inside. Fig. 3 is an enlarged perspective View of the same wall grip.

In these views the entire grip is denoted comprehensively by the numeral 5. Its base, slotted arm, standard and fiat arm are denoted in Fig. 3 by the numerals 11, 12, 13 and 14 respectively. The slot 15 in arm 12 is a rectangular horizontal aperture resembling a mortise, and is of proper size Specification of Letters Patent.

Application filed November 22, 1909.

Patented Nov. '7, 1911. Serial No. 529,483.

and shape to accommodate one end of a horizontal putlog 7. The latter is a piece of timber, usually two inches by four in cross section, and supported at the other end in any convenient manner, as for example by a standard 10, a stirrup 6 and a ledger 17, as shown in. Fig. 1. This slot is so positioned that the end of putlog 7, when inserted through slot 15 in the position shown, may rest upon the top of base 11. The latter, being of uniform width with the rest of the casting, is of sufficient length to afford a safe and ample seat for the superincumbent end 01 the putlog. Standard 13 is a vertical plate, disposed at right angles to the sides of the wall grip and to the flat top of base 11, and of rectangular form as shown. The arm 14, being a normally horizontal plate, has on its under face two ribs or spurs, 8 and 9. These reach directly across arm 14 from edge to edge, and are sharpened at their free edges or V-shaped in cross section, and are preferably about one-fourth of an inch deep. The outer spur 9, as shown in Fig. 3, is cut or divided transversely by a notch 16.

The drawings show the manner in which this appliance is used. It is applied either to a common brick wall 3 or to a veneer wall 2 in the position shown in the drawings, by placing the standard 13 and the flat arm 14 in contact with the face and the top respectively of the topmost outside brick already laid. At the same time one end of putlog 7 is inserted in slot 15 so far as to abut on standard 13, while the other end of the same is supported at the same level by any convenient means as above described. As the common brick wall 3 is carried up by laying bricks above, the fiat arm 14 is embedded thereby in the horizontal mortar joint between bricks above and below, as shown in Fig. 2. From this position it can be afterward removed without any disturbance of the bricks by being drawn out horizontally after being first loosened in its bed by swinging the remote end of the inserted putlog 7 from side to side. When the grip is so applied to a veneer wall, as in Fig. 1, the notch 16 in rib 9 straddles and engages a veneer spike 4, as shown in Fig. 1. When the same is applied to boarding contiguous to a veneer wall, the horizontal arm 14 rests upon a top board 1, while the latter occupies the space between standard 13 and rib 8, leaving rib 9 unemployed.

In operation this wall grip is applied easily and by mere collocation. It affords security of attachment because it engages both the wall and the putlog with a tenacity which increases with the load; the downward thrust upon the grip presses the spurs into a sharp engagement with the wall while the upward thrust of the wall tends to produce a binding effect as between the slotted arm and the inserted end of the putlog, and thereby to resist withdrawal of the latter. In this operation, the strain exerted by the combined putlog and slotted arm as a lever at one end of the grip, tending to rotate the latter about a transverse horizontal axis, is resisted by a similar strain exerted by the wall-engaging arm at the other end of the grip, tending to rotate the latter in an opposite direction. The same appliance reduces to a minimum the requisite quantity of scaffolding lumber by dispensing with all immediate engagements between the scafiolding and the wall. It avoids rendering the lumber unfit for subsequent use in building by engaging the putlog externally and using no nails.

I claim as my invention 1. A wall grip, comprising in a single piece of metal of uniform width a horizontal base, a slotted arm rising obliquely from one end of said base, a vertical standard rising from the other end of said base, and a flat arm projecting horizontally from said standard, and armed with downwardly directed spurs.

2. A wall grip, comprising a horizontal base, a slotted arm rising from one end of said base, a vertical standard rising from the other end of said base, and an arm projecting horizontally from said standard.

3. A wall grip, comprising a fiat base, an inclined arm rising from one end of said base, a slot in said arm, adapted to engage the end of a scaffolding putlog, a vertical standard rising from the other end of said base, and an arln adapted to lie between bricks of two immediately successive layers in a brick wall.

4:. A wall grip, comprising a fiat-topped horizontal base, an oblique slotted arm at one end of said base, a vertical standard at the other end of said base, a fiat horizontal arm at the top of said standard, and two ribshaped spurs on the under side of said arm, one of said spurs being divided by a notch for the accommodation of a veneer spike.

In testimony whereof I have aflixed my signature in presence of two witnesses.

EGBERT IVHITNEY.

Witnesses:

Lor'rm MARTIN, Gno. A. MAGNEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

